release/src/router/mysql/strings/strnmov.c

   1 /* Copyright (c) 2000, 2001, 2007 MySQL AB
   2    Use is subject to license terms.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; version 2 of the License.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; if not, write to the Free Software
  15    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  16 */
  17
  18 /*
  19     strnmov(dst,src,length) moves length characters, or until end, of src to
  20     dst and appends a closing NUL to dst if src is shorter than length.
  21     The result is a pointer to the first NUL in dst, or is dst+n if dst was
  22     truncated.
  23 */
  24
  25 #include <my_global.h>
  26 #include "m_string.h"
  27
  28 char *strnmov(register char *dst, register const char *src, size_t n)
  29 {
  30   while (n-- != 0) {
  31     if (!(*dst++ = *src++)) {
  32       return (char*) dst-1;
  33     }
  34   }
  35   return dst;
  36 }